Cool.
1)
Maybe add a progress bar for the player to know how many enemies left to be fought (like plant vs zombie).
or maybe a list at a corner like:
minion penguin x30
boss penguin x1
so at least the player acknowledge their current kill number
2)
while playing, I noticed the word "Lock" at the upgrade tab (beside slash and multiple). Does it originally mean "Unlock" instead of "Lock"? I am unlocking slash and multiple right?
3)
For one of the ending (BBQ penguin), the ice cubes stacked vertically, kinda makes it hard to be noticed (unless the player read the guideline or they curious if there's another way for this game and start spamming space key around the ice cubes). Maybe the ice cubes can fall into a stair shape? But if it is intended to be that hidden, forget about this point.
PS: overall a nice game. I do miss this art style (pixel-like? idk), brings back good memory. Not sure why the penguin is obsessed with that cactus lol. That penguin bro might need to touch grass but not that green cactus. Good Game.
I blabbered a lot but I was asked to play and provide opinions :) Thank you for the game