Hey, excellent STG game in cave style as always in the series. Bought the full game on booth and enjoyed it a lot so far.
BTW the .exe file is getting flagged as trojan by some antivirus detection engine(s) (see https://www.hybrid-analysis.com/sample/4511bd1d9c54da62103d31d16f64052fee53d55bf... & https://www.virustotal.com/gui/file/4511bd1d9c54da62103d31d16f64052fee53d55bf861...) maybe worth seeing if you can get the file Whitelisted or changed so it doesn't throw errors on users machines? Could also get in the way of Steam or other storefronts.