Hey. I enjoyed playing your game. The rules are very simple despite not including any tutorial in game. There are 2 mini-games: Survival where you collect matching squares/particles and Defense, which is catching debris and protect The Heart from them. I enjoyed both of games. Music is catchy, sound effect are really good, graphics are just squares and pixelated font. It gives retro vibes. Mouse control is comfortable.

However, I don't like sudden irregular color changes in Survival mode. I'm trying to catch red square when the grand square changes his color and you essentially lose one life. I think quick big square flashing for short period before color change would do it. Also, some debris spawn from the middle of screen where I have no chance to protect The Heart in Defense mode. It also feels strange they are not all coming from outside of screen.

To sum up, I like your entry. In my opinion it fits both Theme (No enemies) and jam restriction (Easy). Debris don't attack you, there is no shooting at all and simple and rules are easy to understand. It would be nice to see this game improves and maybe released to Android/iOS devices where arcade games fit best.