Here are some sketches of concepts from my game! The main weapon, the Virus Buster, started out with a boxier shape, but was refined into something more round, before being combined with the original design.

(Descriptions are concepts only and are subject to change)

Virus Buster
Daemon comes equipped with the Virus Buster, a handheld weapon that is capable of eliminating viruses. As you progress, you can find upgrades for your Virus Buster, including special ammo types that can be used to inflate enemies.

Weighty Daemon
Force-feeds Daemon a calorie-dense snack, forcing him to gain a bunch of weight. In this state, Daemon will walk much slower, but his newfound weight can be used to break special blocks. He can also activate pressure plates. He is also invincible in this form. Rooms where you can transform into Weighty Daemon will always include a treadmill, which is used to return to normal. Similar to Fat Wario from Wario Land.

Waterlogged Daemon
Unlike the other transformations, this one is triggered by drinking from a water pump. Daemon becomes
bloated with water, and walks slightly slower (but less slow than Weighty Daemon). In this state, Daemon isn't heavy enough to break blocks or push pressure plates, but he can spit out the water to extinquish fires and dissolve sandy blocks! Holding down the "attack" button will cause Daemon to spray a stream of water out of his mouth until the player releases the "attack" button. Can even be used to inflate special enemies with their mouths open, or pushing things around with the stream.