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I've been testing this fantastic game, I've played it a lot in arcade and I've seen a couple of details that could improve the gameplay.
One when entering the tunnel is too pixel-perfect, in the machine if you do it a bit earlier, the miner keeps going up or down when you press the horizontal key until he can enter the tunnel.
The other one, using the wheelbarrow as a defence on the stairs.
I haven't been able to play much, but that's what I've noticed when playing, those details and that you've done a great job.
Greetings