I thought this one was pretty fun, it reminded me a lot of Kid Chameleon. I don't think the lack of levels is a big deal because it still felt like a very fleshed out game already. I think polishing mechanics is a super important part of game jams instead of loading them up with content because good mechanics will keep the player on board, even if there are only 3 levels instead of 9.
SPOILERS BELOW
I played until the end and checked out the README, but I was kind of disappointed that the F11 function was not revealed until after I finished it. The small screen almost turned me away, but I liked the gameplay enough to keep exploring. I think it could be a better idea to reveal something like that at the beginning if people have poor eyesight or other disabilities but also for convenience's sake.