Three shmups on this one -- not bad! From the article (shooters in bold):

Here is a short description of each game from the developer:

Dogyuun – An intense vertical-scrolling shooter filled with powerful upgrades and fast-paced action.

Grind Stormer – A critically acclaimed shooter offering a dual gameplay style with both "Grind" and "Storm" modes.

Knuckle Bash – A quirky beat 'em up with unique character designs and over-the-top action.

Pipi's & Bibi's – A mischievous platformer with daring challenges, offering a fun and lighthearted arcade adventure.

Snow Bros 2 – The sequel to the much-loved Snow Bros, with new characters and co-op gameplay.

Sky Shark (8-bit version) – A classic shoot 'em up, now presented in its 8-bit version for a nostalgic retro twist.