It would have to be
Wattam.
I had been waiting for Keita Takahashi's new game for a very, very long time, and after 5 years, it finally came out.
Is it perfect? No. It's really short (with roughly 4 hours of game in there). It's only available on EGS (for the PC version). It's not very complex or involved. It feels more aimed at children than Katamari Damacy.
But it's fun, cute, silly, and quirky, and was really what I needed at the time. There's a lot of poop. There are a lot of excited characters that resemble various items in the world or the cast of
Mr. Men and Little Miss. There's a lot of people exploding and people excited by people exploding. It also had a simple story of unity and forgiveness that made me cry at the end.
(It's also the best game in the "strand" genre.)