Just noticed that there were still some big bugs in my game. For some reasons, you might be unable to use the stronger attacks for the three characters (Dodge roll, tackle and water bullets respectively).
Also, it seems like you might not have control over the character at the start of a level, but that can be fixed by Restarting the level from the Pause Screen.
I will fix those at some point and put up a new version, but I will wait until the gamejam voting is done.
If anyone played it and was stuck, you can use that trick above to keep playing the game, or if you are just curious to see the rest, you can watch a full playthrough of the game that I put on youtube here: