First congrats on doing a game alone (if I understood that well). It's a shame you didn't have more time or more people with you because the idea is good and I think it has potential. I don't know what to say about it because I don't know what are design flaws and what is due to a lack of time, but just one thing: you should make it clearer when you can fall to another level and when you'll lose if you do, because right now it's just a trial and error mechanic, which is not particularly fun. If you have time later, you should continue working on this game :)