that's the most constructive feedback I've gotten so far. Didn't think you could get softlocked in the 2nd map and exit 3rd map without the block (showed that I didn't do enough playtesting). Coins are designed in a way that if you miss it, you can come back later to get ;).
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oh. I found a 2nd combination that get you stuck on the 2nd map. Removing the bottom left one seems to fix it. Torn between adding a restart button as an easy way out, or test every combination so you cannot softlock yourself. Also, if you leave the 3rd map without the red block, you still can move to the next area, but having the red block do make it a lot easier.