The game is already playable (well, sort of),but for the first time I'm actually working hard to make sure the game is well built from the ground up, the platforming engine is being constantly being refined as I want the controls to be as good as possible. A platformer without good controls will inevitably be frustrating, and therefore won't be much fun to play.
I already started planning the enemies in the game, and even designed a few, here's some of them (work in progress, but hopefully they won't change much):
Overall, the game is progressing very well, I hope to have a playable alpha by next week or so.