Recently been playing a lot of the little games made by this dev and I've fallen in love with their work, Klorets of course being no exception. It makes great use of the kakusei mechanic for a simple and fun experience for both survival and scoring. The difficulty curve is exponential, but you have a lot of leeway to make mistakes because it's easy to earn back lives.
I love the atmosphere of the game as well, really unique vaporwave vibe mixed with a hint of that classic arcade style. The interstitial story (what I could understand of it, at least) is cute too.
Oh, and did I mention it's free?