I really like the concept of this game. I kept playing for some time, it reminds me of lode runner, in a way.
Not being able to jump can be an interesting design choice, but I think what kinda messed that up was the fact that building ladders had a very high cost and the controls were a bit confusing. For example, when trying to build a ladder higher than a pixel, I had to hold up + down because otherwise the positioning wouldn't work and the ladder wouldn't be built.
I also think the drill machine shouldn't be a one-shot. Maybe a very hard hit, but not a one-shot.
All in all, I think this has a lot of potential. The visuals are charming, and I had a lot of fun fueling the drill machine and watching it go as I gathered resources.