The pacing of the game also felt tedious to play. You'll buy the damage upgrade + invulnerability and blaze through the game. This can be achieved early and your movement is so slow that it's boring. Enemies that go towards you can't go to you if you hold one direction is a bug, and a major one at that. This allows the player to run pass every enemy and bullets while killing everything behind it. The combination of bad pacing of the game and how easy the main game is makes this game bad.
The weapon unlocks are tedious obstacles from the temples you have to go through. Examples of this are the spike mazes, moving obstacles that rotate that you have to wait to go through, killing 'x' amount of enemies that (some even spawning more obstacles that might block your way, so you have to wait for them to despawn), and fetching the torches. This is for all the temples. It honestly feels like a copy pasted concept just for different rewards, leading the player to feel bored while doing the same thing. The uncertainty in what some of the upgrades do discourages the players. If they do buy it, they realize the pay off of the upgrade and end up feeling bad for buying that upgrade.
Instead of making gold, the developers decided to give us ways to earn vaults and character slots. I think it's better this way so that noobs don't spend their money on t9 equipment or some useless items then dying.
 "Crystal Story II"){kind=icon}
 "Eternal Fighter"){kind=icon}
 "Fish Legend Fish"){kind=icon}
 "The Kitten Game"){kind=icon}
 "Realm of the Mad God"){kind=icon}
 "Learn to Fly 3"){kind=icon}
 "Tough Growth"){kind=icon}
 "Super Duck Punch!"){kind=icon}
 "Bit Battles"){kind=icon}
 "Sword and Spoon"){kind=icon}
 "Hordes and Lords"){kind=icon}
 "Paladog"){kind=icon}
 "Goin Up"){kind=icon}
 "Monster Clearer"){kind=icon}
 "Balloon in a Wasteland"){kind=icon}
Nah sorry, this was a prototype so I didn't get to really wrap things up. Know that you are a true fishing legend though :)