It was pretty fun but a little easy and the game felt like it was playing itself after getting the homing bullets (so they are probably a little broken?).
Obviously the levels of polish are amazing, I don't think I need to say this!
Unsure where the merging comes in? Unless I'm missing something I don't think the theme was effectively used... I suppose you can have multiple perks at once and that's neat but I liked stuff I saw in other games like being able to combine multiple spells into one which felt more unique