Icarus X is probably the best "bullet hell" style shooter aside from ESPGaluda II. It's not nearly as complicated, but it's challenging and fun in its simplicity and lack of convoluted scoring mechanics.
some other good shmups I really *really* enjoy SKYSMASH 1918 (I think it's 1918) and its sister game, MORTAL SKIES. Both are really fun shooters. ROSWELL is good, but *entirely* too difficult, and the levels tend to drone on for too long for me. I got a good thrill from the side view shooter UNDERGROUND as well, it's an interesting take. But my personal faves are SKYSMASH and MORTAL SKIES (outside of ESPGALUDA II). Good luck and happy shooting!
Infinity Gene is my favorite too, but I will second those who mentioned Icarus-X, it's a great game and probably the closest thing to Espgaluda. I also love Warblade and Super Laser--been playing both of them like mad. Really, these are all excellent shooters and I think you can get Icarus-X, Warblade and Super Laser for $3 total if they're all still on sale. Perhaps Warblade has gone up to $1.99 now, but still, those three excellent games for $4 can't be beat.
Def. try out Buster Red, too! Super Laser and Assault Squadron also excell. Roswell Figher is not too much compelling compare the the above but it´s FREE for today!!!
Icarus X is amazing, thx and it doesn't cost that much But what are the differences between it and espgaluda? so I can kno what im missing out on
Noiz2sa and Rrootage and Warblades, all are amazingly done PC ports. Don't pay for Noiz2sa, the free version is better and done by another dev, Rrootage should be free as well. Warblades is a dollar, and probably the most feature rich shooter on the app store, and the longest, with a full RPG upgrading system, tons of bonus rounds, secrets and achievments. Noiz2sa and Rrootage are both very hardcore bullet hell type shooters, with simple graphic styles, but great great gameplay. Warblades is a Galaga type shooter on steroids, with limited left to right movement. All control great, and all are worth a look.
Try Fantasy Night of Touhou. Released today. It was priced at ~3 gbp, then dropped to free. No idea why. Not as good as ESP though.
I tried the first level and its pretty fun and in the "bullet hell" genre. Gotta play through the game after work/during free time. I got Shoot the Magic (currently still free) as well, and its pretty fun, but feels sluggish. Its also another bullet hell game. I can beat the game on the easiest difficulty. I'm currently eying Phoenix as well, and that looks like its also bullet hell. The main reason I haven't got yet is I still suck at these types of games. I tend to make big ship movements when I panic, then I die.. =P I'm actually new to the bullet hell genre, and while its really difficult, its still pretty fun. Others have mentioned Noiz2sa and Rrootage and both are fun, with really "minimal" graphics. I tried Icarus-X when it was free, and its alright to me. Its pretty difficult and the background "distracts" me from the enemies and bullets cause it seems really busy. I really like Vetica. Its more of a traditional shmup, but I like the art style of the game. The enemies and weapons are really varied. If you read that thread, the developer explains his logic for types of enemies and their behavior. Its pretty fun and interesting to me.
I recomment our game "iStriker: Rescue & Combat" Its not bullets-hell style, but the gameplay is interesting, You must destroy enemies and rescue your alliance members.