Do you like loot + platforming + randomised levels? Look no further. With elements of Steamworld Dig (randomised mines, collect minerals of ever-increasing value the deeper you go, locate portals for quick returns in trickier parts of the map) this offers plenty of replayability, even though the shooting and platforming elements start to get a little repetitive over what seems to be a single enormous level. Similar to the level creation in Cargo Commander, you give your new level a name and the game randomises it based on that name...somehow.
The deeper you go into the mines, the more chance you have of scoring better guns, although the loot system is a little disappointing. There aren't randomised gun effects, only % stats (higher damage, firing rate, etc) and there are precious few different hats you can wear to give you extra stuff, like 2 additional jumps (yes, you can jump 5, 6 or even 7 times in the air).
Jumping feels a little floaty, and your gun has the annoying tendancy to point upwards when you're jumping up to a higher platform, meaning you inadvertently fire vertically rather than horizontally like you were expecting. However once you get used to how your character moves, you'll be zipping around levels in no time (an XBox 360 controller is recommended).
Your character can only see a limited distance around him/her, and when you get damaged this cone of vision starts to shrink, meaning you can get into some really nasty spots with extremely limited vision - you may find this a welcome addition or an annoyance.
Still, those quibbles aside, Platformines offers a ton of platforming content and that addictive, often elusive "just one more play until I get to the next portal/find a better gun/grab that sparkly bit of ore over there" feel. Here's hoping the developers add more randomised loot and abilities in a future patch. There's certainly no reason to try the demo first and see if you like it.