Definitely a fun game to play, even if it felt a bit easy. I like the idea of adding more weapons to your arsenal as you defeat your foes until you eventually become this unstoppable behemoth of a tank
Graphics are simplistic, which isn't a bad thing. I do wish there were some music in the game instead of hearing the tracks screeching as I roam the wasteland
Speaking of the tracks sound, I believe you might have turned the "Loop" boolean off in the audio source for the track sound effect. This makes the sound effect stop playing after a while
A good game overall with a great potential
Oh and btw, I found your little easter egg :P