OMG I loved your game! I will definitely take this chance to help you improve.
For levels you could do a level that cloud based. Like, floating pillars supporting roofs made of clouds. It would allow for some amazing design, so this level would be a nice addition! You could also create a level where you climb a mountain.
Timed section where the player is launched into a dark gray storm cloud, which they have a limited amount of time (2-3 mins?) to beat. Environment is varying shades of gray circular barriers, with lasers representing lightning being colored yellow and being instant oof with random summoning to prevent players from easily mapping the course after a couple oofs. If you want sentries, use the Cumulus Gims, and hide them in the ceiling. At the end, have a dropper with higher lightning density.
A cavern in which coral grows from the walls, and puddles dot the floors. Some corals have poisonous tendencies – if you touch them, you can either die or get damaged.
Also a little fox might be hiding with a special help for a different level (maybe a dash item??)
SWITCHEROO
you could have a parkour level that’s made up of red and blue barriers and these barriers switch on and off every now and then so like (blue-on then red-off and then it switches) kinda of like the ones in mario
@HappyGoose12 what is this flipswap factory ahh idea
anyways, make an optional, slightly hidden chapter at the beginning called “The Boiler Room” that is the basement of the tower, and has much harder gameplay. however, if you beat it, you can do one of three things: make the game much easier, much harder, or just teleport to the second-to-last chapter.
don’t solution yourself, like @TheCatIsCrazy said, because that is considered solution farming. Instead, solution the idea you liked best>
Edit- why did you like my post, but still solution yourself??