Not bad. but I feel the levels are more mundane than tricky, although some levels were pretty good. Some levels felt unnecessarily inflated, like they could have tested the same logic challenge with less steps. Some levels I found the solution, but some really early unforeseeable mistake meant I had to restart and do it all again, so I was like "nah, I'll just skip to the next level instead of redoing it all"
I strongly recommend adding an undo button to games like this, I.E.: pretty much exactly what all the games on puzzlescript.net have. Also Enter to select is odd.
I see "Most levels by Thinking Rabbit". Does that mean you grabbed the levels from the 1988 game Sako-Ban? That's kinda lame... So I deducted points
Needs music and the graphics could be of more interesting things