This update took a lot of time, more than I expected. But it's here!

It has added several levels, with new challenges, new units and skills. Saying more about them will spoil the game. They're here to be discovered! Besides, I fixed bugs, cleaned up some code and tried to improve some systems.
I'm still focusing on level design, code and systems for now... it's almost done, just a couple more updates. Then I'll focus on the visuals and sounds!
As usual, any feedback is more than welcome. As you may know, I'm working alone on this project next to my freelance work, so the more feedback I get, the more problems I fix !
Have a good game!