Short version: This game feels slow, boring, and unfinished. And the game mechanics seem to be working against itself. That being said, it's probably an okay kids game.
Long version: At first glance, this game seems pretty decent. Twin stick styled overhead shooter with eye pleasing low poly graphics, responsive controls, and decent music. But after playing nearly two hours of it, I can say so far it's been very same-y and disappointing. It's not a roguelike, as I've seen it be referred to as, since there's little penalty for death. It's just a twin stick dungeon crawler type thing.
First off, the combat. WASD moves the character, mouse shoots. You can get limited ammo power ups, wear armor, blah. The enemies are for the most part nonthreatening, so the power ups aren't really vital. Plus the level design is really claustrophobic. So enemies will usually be funneling through narrow halls and doorways, oftentimes getting stuck on each other. The only real danger of being hit is at the start of the floor, when the doors open, and enemies from the adjacent rooms all bum rush you, getting shot from offscreen, or when an enemy decides to hide behind a door frame and ram into you. And because the game is pretty slow at the beginning, you have plenty of time to react to any encroaching danger, at least if you can see it. Another serious issue comes from the fact that the enemy ai doesn't seem to know how to navigate the modular rooms, and frequently gets stuck in door frames. Or if they are a roaming type, end up collecting in a far off corner of the map, no where near the player. The usually frenetic and fun combat that usually comes from twin stick shooters just isn't here.
The level design itself, as I mentioned before, seems to be working against the game mechanics. It's a twin stick shooter shoehorned into tight boxes and hallways. With the exception of the boss fights, which do open up a bit, the level design is nearly identical boxes and hallways. There's really no reason to dodge anything when the better alternative is to just run back into the previous room and shoot enemies as they get stuck in the door frame. There are a few bigger rooms that may spawn, but they usually have a gimmick about them take takes up most of the real estate, but the gimmick is usually 'hold the space bar for a bit'. And even though the floors are randomly generated, it's hard to tell, because thus far they've all looked nearly identical in layout. You start on the bottom left corner of the map, next to a set of bonus rooms you can unlock somewhere on that floor. The exit to the next floor is generally only a few room to the top right, and a tresure chest room reasonably close to that. And a few square rooms scattered around all of this, hiding exit keys and monsters. The boss rooms open up a bit, but the bosses themselves are pretty simplistic and easy.
There's a selection of power ups, but a lot of them seem superfluous. There's spread and split shots, which seem pointless since there's very few areas that aren't tiny boxes with bottle necks. You have homing shots, shots that make your bullets bigger, passive bullet shields, single use bomb like items. You can equip armor that gives you extra hits and passive abilities. But really, you'd probably just be better off pumping all of your stat points into damage and speed and just using whatever else you might have. You can also get stat boosting or reducing mushrooms, but they don't really factor in much, since they seem fairly rare, and barely bump your stats in either direction. So neither risk nor reward.
The bright spots are the graphics and music. The graphics are colorful and pleasing, while still having a low poly look. The overhead prospective is fine, with the exception that enemies can hide behind door frames and get cheap hits on you as a result. Game runs fine, with the exception of the second boss, which for some bizarre reason tanked my framerate down to almost single digits. And the music is chiptune-y and reasonably catchy. Having closed the game out 15 minutes ago, I can't even remember any of the musical tracks already, but it did serve it's purpose of being something inoffensive playing in the background.
Overall, this feels like an early access game that just happened to be put on the full release list. There's not much content (apparently I'm already half way through the game, and the only reason I have almost two hours in it is because of the slow pace), and the combat doesn't change past the tutorial. I can really only recommend it at a deep discount, as a bundle extra, or as something for a younger kid to play. But I can't personally recommend it, considering there's better alternatives on Steam that are cheaper too.