This game can be seen as a sequel to Cube Escape. The graphic style is the same, the gameplay is the same, the settings is the same, some characters are the same... The main difference is that Rusty Lake Hotel is a cohesive game, while Cube Escape was actually a collection of several mini-games.
Apart from that, I can't see any improvement on its predecessor. In fact, I'd say Rusty Lake Hotel is worse.
Part of the charm of Cube Escape was its creepy, disturbing atmosphere. Rusty Lake Hotel is just wierd.
To get full achievements, you have to perform specific actions at specific moments. No clue about what's you're supposed to do. If you miss the chance, there is no turning back. You have to restart the game from the beginning. This is especially annoying, since the game has otherwise zero re-playability and having to go through the same puzzles again is just boring.
Moreover, you can have Cube Escape for free on your mobile, while Rusty Lake Hotel costs you money. I mean, choice's yours...