Excellently playable game, for a solo dev. Especially on WebGL.
It being fun, however, is another thing. As much as couldn't help but feel though the use is tangibly related, it could have possibly been more linked to the theme, if possible on "every life counts". Past that, biggest grip is time pressure not relenting, if even a single life is lost. That can lead to a spiral of losing all lives at least, under deadline rush. Dunno if that's intentional or not, but it made the game less 'fun' on a fair lens.
Also, tank controls plays horrible, in manuveuring around the game itself, gameplay flow wise.