Hello Im searching games like Oniken, Turrican, Truxton or Alex Kidd.

2D
Plattform/Action or both.
Shooters
On GOG.

Not like:
- Jrpg
- Metroidvania.

Thanks.

https://www.gog.com/game/raiden_legacy
https://www.gog.com/game/raiden_3_digital_edition
https://www.gog.com/game/raiden_iv_overkill
https://www.gog.com/game/raiden_v_directors_cut
https://www.gog.com/game/caladrius_blaze
https://www.gog.com/game/revolver360_reactor
https://www.gog.com/game/raptor_call_of_the_shadows_2010_edition
https://www.gog.com/game/stargunner
https://www.gog.com/game/tyrian_2000

for starters... tbh you're not going to have many options in the shmup genre if you limit yourself to GOG, since a lot of games are unlikely to come here or would just get rejected by GOG for being too niche.

edit: forgot Crimzon Clover
https://www.gog.com/game/crimzon_clover_world_ignition

Thank you very much, I'll give a try, I didnt know about shmup on GOG.

I prefer GOG because DRM Free.