Not jumping on the bandwagon.
So I'm giving you an unbiased review. The game is good, but it isn't "10" quality. I haven't seen any like it around Newgrounds so it's a new type for me, which helped with the 8.
The game DID get noticeably difficult, but it was on a moderate slope so I congratulate you on that, since a good number of games go from easy to easier, or from normal to OMFGITSGODZILLA. The concept of Domo-kun holding off the tsunami isn't revolutionary, but it's completely appropriate. Good job.
A suggestion though, to add some more difficulty you could have made a difficulty where the buttons you had to mash were switched up so they weren't predictable since all of them were the same for every level. Just a suggestion though, the game is good enough as it is.
Game: 8
Intentions behind the game: 10