Started playing this Wario game today.
Fun platformer, cool graphics with rich cartoonish animation during gameplay as well. Reminds me of Jazz JackRabbit 2 in some gaming aspects and few songs. The start point of a stage is the same of the end point, so you'll need to move all the way back; just like WL4. Saving merfles is the main goal, but to fully complete a level you need to get all treasures and accomplish the missions stated in each place; if you do it, then you will unlock some good stuff. I suppose it is longer than Wario World, in fact it has more levels and worlds.
In other hand there was a feature that I felt was unnecessary and annoying. Every time before I start playing a stage, a Loading status is spot on. Well... since the time to wait isn't too long, I would prefer if no waiting messages were available. Furthermore, Wario cannot jump while on the ladder, like he could in his previous games (maybe because they decided to make small changes for this title). Shaking things may be tiring sometimes, but the core of the idea is still good.
Nice to see more Wario games aboard. This one is very cool.