This is a very fun game! It's always cool to see platformers that break common conventions. I really like the visuals and the sounds (especially the jump sound)! I'm not sure how I feel about the lives system. Nothing about the game felt frustrating so I had no issues with it, but if there were more levels it could make the game a lot more tense. If you work on this more post-jam and add more levels it might be good to also add a way to get extra lives, (maybe every couple of points added to your score gets you an extra life).
Overall, great job!