Played through the first boss and a little bit more after. The game is somewhat charming, has a decent soundtrack, ok controls, and a few different attack types, plus a controlled companion rocket to blast enemies. While playing the game i was thinking it was going to be priced at 10 or 15 dollars, and so i thought it might be not worth it, but seeing as it's 5 dollars (and less with launch sale) I'm going to go ahead and say get it. It has a lot of levels to play through and objects to finish through them. But here's why i was think it wasn't worth it, for me atleast.
One is that the some of the boss fights (like the first one) is a sort of a race fight where you run from imminent death, dodging attacks and not falling, that's fine but the level wasn't a good design, so i found myself frustratingly dying because of it, and there isn't any check points durring these fights so you would restart it from the begging.
Another problem is one of the levels where you have to stand on a moving platform moving to the end of that level, you have to keep adjusting your movement on that platform so you won't fall (left and right arrow keys) and sometimes jump, now that's fine, but when the controls aren't as responsive as you need it to be, you will find yourselft not preforming these tasks the way you would expect, also when you double-hit left or right arrow keys fast you would dash in the direction you pressed them, and since you press them fast to keep your balance on the moving platform, you would accidentally dash away from the platform and die, and also there is not check point for those kinds of levels too.
So the gist of it is, some levels are badly designed, and controls aren't as tight as you want them to be. But make your choice, i was going to not recommend it but seeing as it's 5 dollars, i say get it why not, just remember that some levels will frustrate you.
I just hope the devs make a more tested, with more tight controls, and see things more clearly before they release their next platforming game if they ever make another one.