Wow I have just spent a LOT of time playing this game

Levels 1-3 were very very good. I really felt like I was learning strategy and skill for the game. Then I got to the level with slime, and I tried the idea of sending 1-3 guys in to suicide near the start and take out nearby slime balls, and then I just essentially made a bigger and bigger U shape to get to all the gold. In the previous levels I made tunnels and worked out strategy to convince my guys when to go down and went to go up. In this level I just made a big U and tried to go as fast as I could since I had sooo many guys. I was racing against the clock essentially to keep up with the rising slime. So I beat that level and felt lucky and also felt like I didn't use as much skill.
I can't remember if the slime level is 3 or 4... but when I got to 6 and it said I wouldn't beat it.. yeah... it was right

I just could move fast enough really. Wow, fun stuff.
I didn't experience any fluctuations in speed, it was all very constant for me with no spikes surprisingly. In the first few levels I could manage to keep up and with enough tries beat the levels, however past that there was just too much motion too fast to organize. I think making the whole game just a LITTLE bit slower would be nice. Or a button to change the speed even.
All in all, great game! Amazing for 4k for sure. Good job

Dec 18 12:02am
EDIT: I keep playing the first few levels over and over

I get to the level with slime and close the game. Dead miners make me sad so I don't want to deal with the slime haha.
Dec 18 11:33pm
EDIT 2: I think I have an idea that I would enjoy! Perhaps instead of explode on slime, you could make it impassable and instead you have to take rock to the slime and deposit it to build a wall around it to contain it? Or perhaps exclude the rock part but every time a miner runs into slime, he changes one pixel of it to metal and turns around like he hit a wall... or just like it works with gold deposits, but instead of taking a pixel you simply "change" a pixel. That way you'd have to get a lot of miners on slime to stop it from spreading and keep it from covering up more gold and getting more in the way. I think that could be doable. The general code I have in my head suggests that you could take the bytes you have for the exploding on slime action and code in the "deposit metal" action instead. Hopefully that wouldn't take too much space. Either way of course you don't actually have to do this, but I much prefer "handling" the slime to killing poor little miners

you *have* to be kidding!!!
Killing your miners is the best bit!!! =D