There are hidden achievements in the demo and the full game - obviously more in the full game right now. There will be more as we release more content as well.
The minigame should work, you can move left and right with the left and right arrow keys and click to move forward, might also be able to use space as well. If it’s not working I’m not sure what the issue is, some people on the discord might be able to diagnose it.
We’re currently translating the game into russian, I don’t know about other languages, if you’re interested in translating you’ll have to hope on the discord and talk to LittleNapoleon, our lead developer about it!