Just fyi, there's a hole in the death zone in the fourth level. I just kept falling and I had to exit to the main menu, losing all progress. I played through the game again and hoped it was a once off thing but it happened again. I gave up after that. Another bug I encountered is that after you quit back to the main menu and try to start the game again, the first line plays but the screen is left completely black and you're forced to close the game.
The main characters' designs, with their exaggerated noses, are really good. The enemy design is nice as well. The voiced lines are cool at first but after hearing them over and over after dying, which happens a lot, they get pretty annoying. The same goes with the music track.
The platforming is a mixed bag. If you were going for a rage game, it fits. But if not, it feels really unfair. It might be the case where you need to press the button exactly when you're on the ground which sounds fair on paper but in practice, it feels like the game is ignoring your inputs. As well as that if you don't land exactly on the center of those one block wide platforms, your character just slips off the edge. I would've liked to have seen the ending but the platforming just turned me off from trying a third time.
All in all, the artistic approach to the game was a job well done while the platforming is just a bit too unfair for my liking. If you want, check out Jonas' tips for making platformers feel good here, if you haven't already.