When comparing Cave Story vs FlightGear, the Slant community recommends FlightGear for most people. In the question“What are the best free (No F2P!) games for PC?” FlightGear is ranked 17th while Cave Story is ranked 41st. The most important reason people chose FlightGear is:
FlightGear has scenery that contains environments to fly in from the whole globe.
Specs
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Pros
Pro Gameplay and Content
Extremely fluid controls and interesting level mechanics makes this game a joy to play. Furthermore, there is about 4-5 hours of content to this free game.
Pro Multiple Endings
For being a free game, the amount of content is astounding. There are a total of three endings, and there are a lot of extras that you can get as well (as well as a hidden area). These endings are determined by your choices throughout the game.
Pro Considered an Indie Classic
Created in 2005, Cave Story helped spark the indie movement in game development. This entire game was created from scratch by one developer in his free time. Everything, from plot, gameplay, assets, and music were all created by this man.
This game sparked so much praise that it received a Steam port, a 3DS port, and a Wii port. Though all of these ports have bonus content and are "remastered" versions of the game, the original game is free and for the PC.
Pro Worldwide scenery
FlightGear has scenery that contains environments to fly in from the whole globe.
Pro Free and Open Source
All code written for FlightGear is opensource and available for anyone to use.
Pro Crash animations in some aircrafts
Pro It has world-wide multiplayer
Pro Live cockpit
Pro A lot of aircrafts to add
Pro It has amazing graphics
Pro You can almost recreate real incidents
Pro No bugs
Cons
Con Replayability
Upon completing the game, there isn't too much replay value. You could try to get different endings or get different character customizations, but the plot is, in general, the same throughout each playthrough.
However, the Steam Port "Cave Story +", the 3DS port "Cave Story 3D" and the Wii Port should all have some bonus content (though, you have to pay to get these versions of the game).
Con Not as graphically advanced as commercial competition
Con Getting stuck upside down
After a crash a pilot may be stuck in an upside down position with no way to recover.