I'm not 100% sure of the aim of the game. I'm guessing I need to try and get as many heart blocks as possible to increase my heart but the timer counts down regardless?
I did find I can just spam the spacebar as I walk into the block to make it so I grab it as soon as it appears though.
Also I found that my character always aimed down regardless of the last direction I used.
The art does however look very nice.