Here's my(small)wishlist:

1.Give Tweedle some behaviour and animations

2.Fix Devan so he doesn't take huge damage from one non-weapon attack and make it so if you stomp him into a devil, he doesn't die in one hit.Urgh, thats annoying!(From a designer's point of view)

3.Make events work on the very sides of the screen.

4.Give all bosses "intro text", not just Robot Devan.

5.Make Robot Devan work properly with other bosses, so he's not
limited to one boss to control.(EG:Able to control Bolly as well as Robot)

6.Fix Bolly so if you die while fighting him, you don't see Bolly's empty bottom area floating there until you touch Activate Boss.

7.Add a "miniboss" of whatever parameter so you can make more than one boss fight per level.

8.Add "Jazz Boss" into event list so you don't have to use an MCE to work it

9.FIX THE "CONNECTION TIMED OUT"ERROR!! That infuriates me to NO END!

...That's all I can think of for now.