Decent, but not for everyone.
The art and animation is fantastic, the platforming and controls are super tight, and it's an overall very solid Metroidvania game.
So, why did I rate it 3 stars?
1. The time stopping mechanic that the game is named after is barely used. You have access to it from the very beginning of the game, but about 90% of your uses for it occur in the first 2-3 areas. After that, you'll very rarely be presented with a puzzle that requires you to briefly use it to get access to an otherwise unreachable area (but even then, you get a double jump later that renders it almost entirely moot). You can't damage enemies when time is stopped, so it's not useful in combat other than to dodge a projectile or something, but enemies telegraph their moves pretty blatantly, so I never needed to do that.
2. You can switch between a lot of different types of weapons which level up as you use them, but realistically you're just going to pick the one you like the best and use it for the whole game. Each has its own damage type, and each of the 80 enemies in the game has their own resistances and vulnerabilities, but it doesn't make enough of a difference to bother swapping loadouts.
3. The game is very short. I achieved 100% completion in about 15 hours. You could finish the game in much less time than that and still get the best ending.
4. It's too easy unless you use the most extreme difficulty option, but you'll have to complete the game at least once to unlock it. Unless you're hardcore in love with the experience, you're probably not going to go through that again. It would be nice if that difficulty were available from the beginning, because I think it's a more appropriate challenge for experienced genre fans. Boss fights don't demand much strategy other than spamming your attacks or spells. You can access the inventory at any time (which pauses the game) and chug healing items to your heart's content. I almost never had to use a healing item in the entire game, though.