I like this game a lot! Good original concept, controls feel really sharp, the graphics have a nice consistent style. I just wish there were more stages to play! Make Wonder Bounce 2!
Same sentiment as has already been expressed here. Fantastic job in the basic implementation. Needs more to stay fun for more than about 90 seconds. Make the score timer count milliseconds. Give the player a jump. Throw in lots more balls, even different colors with different behaviors. Add other forces besides balls appearing? And, of course, music.
This is quite fun. Love the look. I never felt the need to upgrade very much besides my weapons. Would have also been nice to have a few more levels and a second boss.