itch.io

I had a quick go of your game so only a short review. 

The font size is way too small. This is fairly critical and something you should consider addressing sooner rather than later. 
It was actually unplayable for me, I couldn't read the text without bringing my face much closer to the screen, even then it was a struggle. 

So I tried clicking all the buttons to see if I could figure out how to play. I clicked everything I could see and nothing seemed to happen that I could make sense of, it looked like I was buying things and I had to open a store in order to continue. With the amount of information on screen and the tiny tiny font size, I really struggled to figure out what I was doing. 

I typically avoid reading a description before I play because I believe things should be intuitive and self teaching. I went back and read the description. It seemed to communicate what I had observed in game, that is I had bought some things and needed to open my store. No guide on how to open a store though.
I tried playing again, clicking all the buttons to attempt to open a store. I could see a disabled "open store first" button, but no actual button to open my store. 

To answer your question: The first 5 minutes of this game was confusing. I had no idea what I was doing and felt like I was unable to actually 'play' the game.

+1 to the confusion of the line only sometimes coming out of the yellow ball. I didn't realise it was intended to be that way until I came to the comments. I found the game had a lag spike whenever a ball exploded too.