I see some potential in this game.
I think I got a bug in level 4 (?), where there's 2 enemies. I somehow managed to make the first one fall down, and now the second one is blocking the way so it's impossible to get through.
I hope you can keep working on improving your game!
Also, if you find the current engine is a limitation, maybe consider developing on Unity? As far as I know, there are no real limitations on its free license version.
Good luck!