Fun little game! At first i had to figure out that i need to hold the mouse button to make the fireball bigger. I haven't quite understood yet whether it makes sense not to charge the fireball completely, it felt like it is the only way to play. I also find the number above the fireball a bit distracting, because i don't know what it means anyway (size, damage?). The fact that the fireball gets visually bigger would have been enough for me to convey that it does more than small fireballs. Despite that i think you did a good job. Love the artstyle of the slimes. Keep it up!