Disclaimer: I typically don't play platformers. My skill level is no where near any hardcore SMB fans. So my experience with the difficulty may differ from yours.

Almost There has a good amount of levels and a very balanced difficulty curve. All mechanics are first introduced in an easy level first and then expanded on harder levels. The game doesn't have any forced tutorials which is great. I also feel that the timing requirements are quite fair but I'm not one to chase high scores in this type of game.

Controls are very important to get right in a platformer and I think the game does a good job at it. The controls feel quite tight. The wall jumping controls are a bit awkward but it allows you to control your wall jump distance. Some levels even require you to utilize your wall jump distance. The lack of a ledge grab makes for some annoying jump misses every now and then.

The level design is solid overall. It can be a bit monotonous but that's mostly due to how small the levels are. But that means it's great for playing on breaks.

I will say that the dash is a bit annoying. The problem is that only some jumps will require dashing and you might not be able to dash if you land on the middle of a platform. It could've been a power up or a one button affair like Celeste. But you can figure out whether you need to dash based on the platform length.

Graphics are minimalistic but it is not necessary for this type of game. The simpler graphics actually makes it easier to spot spikes.

Music fits each world but some variety between the tiers of each world would be nice.

Nitpicks:
1. There should some sort of visual indicator for moving props (moving platforms, spikes etc). There's a level on the 1st world where you need to wait for a moving platform. And you can easily mistake it for a regular one. It's also impossible to distinguish between different turrets since the y all look the same.  Even a subtle difference would help and reduce trial and error.

2. Lasers are a bit underwhelming. The solid edges of the rectangle are quite jarring (IF you're like me). There should be some extra sprite at the end of the laser if it hits a platform. If the lasers are done via Unity's line renderer, then this should be quick fix IMO. Also, some sound effects when the laser hits a platform would be nice.

3. Some SFX for death, dashing and props(moving platforms,spikes) would be nice as well.

Overall, this is a very solid platformer for the price. It's not so hard that it would intimidate casual players but has enough difficulty to keep you invested.