Hey, this was a pretty neat little arcade game you got here! The whole aspect of having to play multiple mini-games simultaneously was rather novel and challenging, and I enjoyed trying to juggle them as best as I could. I like the variety of games present (though I wish there were even more and it kept escalating further) and the general presentation and construction was polished. I also liked the little weird touches the game had, like the way you can click and hold on the title graphic to make it shrink and invert for some reason: felt like Mario 64, haha!
I definitely did have a bit of a rough time learning the game at first, as the game doesn't make the controls very apparent: for example, I didn't realize I had to switch to using AD when the third game popped-up as I assumed it was also going to use the arrow keys. It's be nice if the control prompts were made larger and were given clearer warning.
This is just me, but I also thought it would've been interesting if some of the games had overlapping/intersecting controls, like if they all had to be controlled with the arrow keys and you had to manage when that would clash in clever ways, but it's fine as it is: just food for thought!
Also, I'm not sure what difference the difficulty choices make: to be honest, they seemed to be the same to me, but maybe I'm missing something subtle.