Thank you, this is so great to hear! I'm so happy you think the difficulty curve is balanced. The last level is horribly challanging, no one in our team has yet to beat it without the blueprint haha. It should have been put as a bonus level. You basically completed the game by completing the level before :D
(The difficulty bump between lvl 15 and lvl 16 is just way to big, unfortunately we didn't have time to make the levels that would fit in between)