The cheats were made with Cheat Engine 7.5, featuring a code written in Assembly and Lua.
Sample video
About cheats
For example, when the enemy executes a spellcard in story mode and shoots any kind of bullets, move the cursor inside the window and press "Shift" key to grab all active bullets and let then can hit the enemy instead of player. While holding "Shift" move the mouse cursor anywhere to guide bullets anywhere. You can release "Shift" and hold "Ctrl" to let bullets chase enemy, or "Supr" to delete them.
Also used a cheat for invincibility, and for hold "Num1" to extend player1's spellcard usage.