I actually like the little added touch of venting your frustration on a puzzle by having the character bonk their head on a wall x) It's a solid concept and can definitely see that you had more ideas and mechanics you wanted to build upon towards the end, keep it up !
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Thank you for the kind words! :) I plan to release some updates to the game in the future, that explore those other ideas and mechanics a bit more. However, I'm not quite sure yet if I will stick with the only one key per color theme. As others have already pointed out, as of now this is basically a limitation without meaning (in terms of gameplay) - and I haven't yet found a solution to fix that... :(