Hey thanks!
Regarding the controls, yeah, they are a mess, coincidentally the reworked mapping includes some of the things you proposed! both that 1,2 and 3 map to each pipe, and that space maps to jump. Also, the mouse will now control the actions (drilling, piping), and you will be able to rotate the pipe using the mouse wheel.
The jump height feels odd due to a misunderstanding, I (the developer) intended for the character to be about 3/4 of a block tall , but the sprite sheet (which was made one day before deadline) ended up being about 4/3 of a block tall, so I ended up enlarging the collision box, giving him a shorter-feeling jump than intended (and making him unable to go through 1 block tunnels)
The reason the jump itself is shorter than 1 block is because we wanted to encourage a more strategic use of ladders. We might end up making it at least 1 block high post jam though.
Thank you for your critique and I'm glad you enjoyed it!