The thumbnail gave me Super House of Dead Ninjas vibes and it looks like I wasn't wrong. Overall really fun game, good graphics, sound effects and well designed, but I have two points of criticism:
- The checkpoints should be along the way, instead of in a separate room off to the side. This way players might accidentally miss a checkpoint without realizing, or start going the wrong way, because the checkpoint room is a sideshoot in an otherwise linear level design
- The final boss takes longer than expected, mainly because there's a long phase where you can't hurt him, but my bigger issue is that the flames and explosion that appears when you kill a tentacle obscures any new tentacles that might appear in the same place. I also wasn't sure whether killing the tentacles hurts the boss, or if I should just keep hitting it directly.
Otherwise really fun game, good job!