Hi, great game, i only miss some soundeffects. really cool artstyle and gameplay. 

Just a great game! It's interesting to play! A stylish visual. If you also added sound, it would be just great.

Tell me, how complex is your algorithm for generating stones and other elements? Do they just appear randomly? Or is there a more complicated scheme?

excellent !  I like the minimalist work art, the differents difficulties (manage the drill... ) .... Very addictive ! 

Simple and fun gameplay. I love the artwork and weightiness of the drill. The upgrade system makes is also a very nice addition and adds a reason to keep playing. A great submission overall.

Very good game. Simple and funny.  love the arts, and I'm very impressed you also included upgrades.

Like others, I'm not at ease with the controls, it's the main drawback as to me. (and then the lack of sfx)

Great game with a polished feel. The art style is well done and you have a clear gameplay loop. I like that you have upgrades, it gives some motivation to keep going back so you can become faster.

Some feedback:

• Sounds effects would bring this game to the next level.
• I agree with other commenters that the controls are not intuitive and have  a learning curve. An option to invert keyboard controls or even an option to use mouse instead would be great.

Really nice concept and I like the simplistic art, it just works! it feels like a mix between Downwell and PepperGrinder :P I think my brain would prefer the controls inverted but otherwise it plays well. I think the progression could be a bit faster and I would have liked some sound effects, at least for collecting the gems :) Great job!

It looks really fun and I like the art style. 

Sadly, I'm not able to play it properly though because of the controls -
I can't wrap my head around that pressing left makes the drill do a right turn and the other way around - I always end up turning the wrong direction 😭