The tank part was truly amazing. Very responsive in terms of sound effects, camera, mouse movement, and so forth. Really cute font too! I liked the robot designs. Maybe some more enemy variety would have helped, even if it was like the base robots dying in one hit while new red ones could spawn with extra HP. The arrow gradually coming into view was awesome and so was the music.
I'm sad to say I did not enjoy the platforming part. The transition seemed very random, the sound design was extremely lacking, and the player could not shoot left.
I think it would benefit greatly if you took an ActRaiser approach and made it so the more points you earned in the tank segment, the bigger your health bar in the platforming segment. The game would truly feel like more than the sum of its parts then.