Nice little game, but there are a few issues.
You should really spam proof your altar. I was able to beat the game only collecting 7 gems, just by spamming the altar, skipping the 2 other levels by doing so and reaching the credits.
I don't like that the enemies can still block your shot and deal damage during their death animation.
And it would be nice if there was a maximum distance the drone can fly either from your robot, or from the level bounds.
I did beat the game legit once, without altar spam
Multitasking shooting, moving your robot, and controlling the bot was a lot of fun, though a bit repetitive with the size of the last level. Visually it looks good, and sounds and music were also good.
Neat game.