Listen. I love this game. It's one of a kind. If you like metroidvania type games you should definitely check it out especially when it's only 2.99 right now on sale. What makes it so unique compared to other games of the kind is that every level is a tile on the turn based strategy game portion, and what level you will want to do is going to be decided by what you need to be happening strategically.
What makes the game such a fun challenge is that each tile has a difficulty percentage that can vary widely depending on different factors including what is happening in the strategy portion. So, you might really need to open up a section of a map that's blocked by a tile with %500 difficulty level, but have fun with those crazy fast enemies and projectiles that knock off a third of your health, but hey, you gotta do what you gotta do. Or, what if you can't make it through? Time to rethink your strategy, work on earning enough coins to hire mercenaries to open it up for you, tweak your character to go for speed over health, or or whatever else you can think of. The world has it's own rules and mysteries and a lot of the fun is these things slowly becoming apparent to you as you play.
What I love about the game is all the variety in the side scrolling action and it's effect in making your strategy come together to win the game. I think personally this game is tied with Red Faction Guerilla for most underrated, but this probably even more for all the hate it gets from people that can't look past its subpar graphics to see the amazing gameplay and feeling of being in a coherent world with its own inherent logic all coming together in a challenging and satisfying experience. Just like other Arcen games there are lots of difficulty settings, I suggest you crank it up a bit.