"This is honestly the easiest game I've ever played on Greenfoot." Not any more... http://www.greenfootgallery.org/scenarios/685 :P OK, yes that's rather sad, I admit it!

Instead of adding more I'd work on simplifying it a bit or at least making the attacks a bit more coherent - there's a lot of them at the moment and as mbread said it can take a while to figure them all out. I'd personally suggest just picking a couple or so of attacks and work on improving them rather than adding lots of different ones.

suggestion: you can bounce on the bomb currently, so make it not possible to bounce on it? That makes the game a lot easier: i can fly through the air by bouncing on bombs.

mjrb4, I do not understand clearly the message that you are attempting to deliver... Although I got the part about the variety of attacks...

Well, as said before there's a lot of attacks at the moment and remembering them all is tricky. How about introducing them one by one throughout the different levels, tutorial style to get people into the game and used to them? That's one way of doing it.