yeah this seems to happen in some browsers. Playing in chrome should hopefully fix it. What browser did you play in, so far I only encountered this problem in brave.
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oh ok then im really sorry. It might be because the background drawings are rather big (5-10MB per layer), I should prbly compress those 🥲. If you have access to another computer with more RAM or another browser like firefox, you could try that but in my experience, chrome ran the best. If you get it fixed, i‘d be really interested on how :))
Much fun to you playing the game and all other games!