This was a interesting idea for a game, though a bit slow paced. I unfortunately ran in to a crash on level 3 (browser version) and noticed the exit button in the pause menu didn't appear to work.
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I'm sad that you have a bug. The game has a level selection and you can skip the levels that you have already completed. The game has a boss fight and I really like it, I advise you to go through it too, I think you will like it, although it could have been done better. You are right about the exit button, thank you for noticing. We forgot to change the condition in the code when we uploaded the latest version. Thank you for writing this. Personally, this is very valuable to me