it was a really fun puzzle game! simple but effective design, and i love when 'tutorial' text has some personality in it
a small suggestion as an anti-frustration mechanics: it would've been really nice if color-changing pluses would've actually colored in the color they recolor the player's control to: when there are a bunch of them in the same place, it's frustrating to remember which one would color your cursor in which way. i also don't think it "eases up" the game as you still need to solve the puzzle but it removes a lot of frustrating replays where you have the idea on how to solve the puzzle but you forget which one of the six plus signs in a single row recolors your cursor in which color
p.s. also, for some reason WASD worked perfectly for me, but arrows worked only right and left, not top and bottom ones.
overall, great job!