I find it really interesting to see what games looked like during planning and development, seeing how much changed and what didn't change. It's pretty cool to see the completely different early concepts for Umihara Kawase and how that process led to the idea of swinging around and attacking enemies with a fishing line. As Canvas noted, the fishing line prototype's textures have a familiar feel, and the prototype even has a familiar level -- the prototype's Test Stage 3 becoming the final game's Field 10. I definitely agree that the enemies' speed makes it look pretty hectic and I'm glad that was changed for the final release. It does make me wonder, though, what the final game would be like to play with faster enemies (but without the respawning!)