Nice! Maths games aren’t really my thing (and from the looks of the scores, probably aren’t most people’s thing) but I can see a good game with some good mechanics at play. I can’t tell if I’m bad or if this is one of those fiendishly difficult games, just as I can’t tell if I’m stuck on level 9 of 10 or 9 of 9000. Adding in a level select menu can help with that second issue though.

Nice

Not bad. The only complaint is that when playing on mobile, the game field sometimes overlap the undo button and you only can restart the level completely. Also, it seems that on mobile buttons either work with delay or doesn't respond to tapping correctly sometimes
Edit: also no progress saving on mobile