Hey, thanks for your support and feedback!
The first part of your review is planned :) The player will transform and stay in this form for stage 2. There will be a different transformation or something similar in stage 2 (but it is not implemented yet).
But because the enemies are very different to stage 1, the next transformation will be not a succession from the first. Also This would leave with 9 transformations instead of 3 (so 3x more work and I have still a lot to do for the game already). I like the idea though :)