the 2nd screenshot you provided with the crazy yellow, green, blue, pink and orange schemes... that looks like a crazy trip on the eyes lol.
There's a character called the fisherman who has -100% for the price of bait. If you buy the bait, you get an awesome amount of damage (and you can buy as much bait as you technically want). For each bait bought, you get a ton of special enemies at the start of the next round that pretty much bullet hell you.
Rough but it was funPage created in 0.381 seconds with 18 queries.