I'm guessing we're supposed to use spacebar to do something but I can't tell what. Otherwise this is a nice little box pusher game. I wish that there different sound effects other than extremely repetitive "cheap" every time you move. By relying on time tested mechanics you made something that was genuinely fun to play, although very familiar.
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The spacebar is only used in the final level (level 11), so if you didn’t reach that point yet it might feel unclear. I’ll make that more readable earlier. About the sound, there are actually 5 different chirp variations that play randomly, but I agree it can still feel repetitive over time, so I’ll keep improving that. Glad you enjoyed the core puzzle design, even if it feels familiar—that was intentional to keep it easy to pick up.