DuckLaserDuck

You're a duck that shoots lasers out of its mouth, and a bunch of bugs stole your eggs. Naturally, the only reasonable thing to do is kill all of them.
DuckLaserDuck is a roguelike bullet-hell shooter where you fight through increasingly difficult hordes of bugs and critters, collecting upgrades that turn your otherwise ordinary mouth lasers into something considerably more destructive.
The goal is to get your eggs back. The method is excessive violence.
Kill bugs, get stronger, kill bugs EVEN BETTER.
Start with one of four weapons, each with its own strengths and weaknesses, and collect upgrades as you make your way through the game.
There are over 100 upgrades to find, and a lot of them interact with each other in interesting ways. You can make your lasers bounce between enemies, explode, freeze things, summon lightning, and plenty of other stuff. Some upgrades might not seem particularly impressive on their own, but combining the right ones can turn a fairly mediocre build into something completely ridiculous.
Of course, you don't get to choose exactly what you find, so sometimes you'll have to get a little creative.
Try not to die.
You'll fight through 3 stages, each with its own enemies, environments, and bosses. Some enemies are relatively easy to deal with on their own, but become a much bigger problem when they're attacking you alongside several other types.
There are also bosses with their own attacks and mechanics to learn, and they're not particularly interested in letting you get your eggs back.
Health isn't exactly plentiful either, so you'll probably want to dodge all those bullets instead of standing there and hoping your upgrades will save you.
Different paths, different builds.
Each run features randomly generated maps made from hand-crafted rooms, with branching paths, shops, special events, and different rewards.
You might find exactly the upgrades you need to make your build work, or you might end up with a completely different combination that turns out to be even better. There's a lot of room to experiment, and plenty of opportunities to make questionable decisions along the way.
There are also hats.
You can unlock and wear 11 different hats.
They don't make your lasers stronger. They just look pretty cool.
Key Features
Over 100 upgrades with a variety of effects and synergies to experiment with.

4 starting weapons, all of which you shoot out of your mouth, because you're a duck.

3 stages with different environments, enemies, and bosses.

5 unique bosses with their own attacks and mechanics.

Randomly generated maps featuring hand-crafted rooms, branching paths, shops, and events.

Lots of different enemies with attacks and behaviors that complement each other.

11 unlockable hats, which are obviously very important.

Anyway, your eggs aren't going to rescue themselves. Go KILL THE BUGS.