Read the readme labelled "Read This You Mongs". And I mean READ IT. Not spoiling it for you, it's a dev design thing.
As for tutorial, it goes as follows:
Tut1: you can hold W (default key) to walk diagonally. That's it.
Tut2: In you skills tab (press X to access menu, press Q/W to go through menu tabs, I know, it sucks) or in your quick access tabs (A and S - press S in this case - then arrow keys to which skill you wanna use), you can do a skill called "quick-swap" which allows you to equip things quickly. Otherwise, you take a turn to equip the guns, which is a precious turn lost when you get to it.
Tut3: You can double-press W to "search" the ground for traps in the direction you are facing. Traps are bad. Searching is good. Then you can hold Shift to walk onto those traps without triggering them.
Tut4 (and this one's a bitch!): you have a skill called "rondato" (when equipped with guns or nothing) or "angelic halow" (melee equipped) that allows you to jump exactly 2 spaces in eight cardinal(?) directions, when you get a run up (and you have the status called "running, denoted by three arrows)
Or you can wall kick (hold Q and press Z, or hold Z to select the attack) off a wall or an enemy to gain it instead.
This game is not for casual play. At least, not on regular mode.