I really enjoyed the nostalgic vibes and the difficulty twist was interesting ! The only downside was some quirky control issues, but they didn't take away from the overall fun.
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Since the mouse isn't really used when navigating through the world, simply capturing the mouse movements without asking to click would go a long way making gameplay go smoother :)
Apart from mobile games, it is unusual to use a press and release type of input on top of movement to rotate the camera
On the combat side, since the player needs to constantly moving, having abilities tied to E and R require the player to use his middle finger or index. You could bind it to C/V and spacebar for example to require instead a thumb movement and not hinder the fingers used to move :)