The base movement speed is a bit slow, and a map would be nice- I got quite lost, and the slow base movement made it just kinda "slowly bumbling around these areas where i already killed the enemies"
Despite that, it's pretty fun! The first time i found a "Multiply yourself" upgrade I just kept going for them! by the end, i had an army of like, 10 slimes, each firing 4 shots per click. It was very enjoyable to see a boss and just unleash a tsunami of bullets at them! The xp didn't seem to do much, or rather, even after beating the game, i only had maybe 1/10th of the bar full.
Overall, pretty good!