Hitboxes are super hard to get right without other people to playtest, I find: if you know where they are to begin with, it's pretty much impossible to look at the game in the same way as someone coming to it for the first time. Even if you trace a circle around the mines, there's a question of whether or not you expand it to include the little spiky trigger points.
The controls really do strike me as potential for a post-jam update rather than a must-have to begin with. I'd also be interested to see a mobile version, though I expect that would probably take a more substantial re-think. I'm guessing that swiping left/right with an on-screen button to separate might work nicely, but it's hard to imagine how that might actually feel to play or if there might be a better option available. If you do tackle another version after the jam I'd be keen to see it!