It sounds amazing, I have some ideas for your post such as:
Shield of Cthulhu + Bone Glove = You can dash and when dashing you throw a bunch of bones and eyes that do extra damage.
Worm Scarf + Shiny Stone = Reduces 17% damage and buffed to 40% while not moving and increases life regeneration while not moving.
Royal Gel + Volatile Gelatin = Slimes are friendly and will receive damage from other sources, each released volatile gelatin will drop an slime(this might be useful because slimes now can be damaged by other enemies and the slimes might get the hit for you).
Hive Pack + Brain of confusion = Hive Mind (This one gets even a name) When damaged has a 60% chance to inflict confusion and summon a swarm to attack close enemies and a 16% chance to dodge the attack completely, also buffs player summoned friendly bees.
Bone Helm + Spore Sac = Summons spores over time that will damage enemies, when enemies explode a Spore an angry Shadow hand will attack them twice, has 32% chance of creating another spore instantly after exploding one.
Soaring Insignia + Gravity Globe = Increases flight and jump mobility and grants infinite wing and rocket boot flight, allows the user to flip gravity at will, also will let you not receive fall damage. (Just because Gravity Globe is completely trash).