The game is magnificent!
I love the probe, it's simple but I love the design. The 3D mix in a 2D world isn't always easy to make graphically coherent, and here it's a success.
Too bad there isn't a little system for upgrading the probe :)
There are auto upgrades at certain levels, but yes adding more and getting to choose upgrades would be more fun I think. Thanks much for your feedback. Glad you liked it.