Incorporating a variety of gameplay elements can help to keep players engaged and add replay value to an indie game. Slot machines, missions, microgames, and PVP battles are all elements that can be particularly effective in achieving this goal.
Slot machines are a classic casino-inspired gameplay element that can be incorporated into an indie game in a number of ways. One possibility is to include a virtual slot machine minigame that players can access in between levels or as a break from the main gameplay. This can provide a fun and lighthearted distraction for players, and can also offer an opportunity for players to win in-game rewards or currency.
Missions are another gameplay element that can add depth and variety to an indie game. These can be objectives that players must complete in order to progress through the game, or optional challenges that offer additional rewards or achievements. Missions can be designed to encourage exploration, puzzle-solving, or other types of gameplay, and can help to keep players motivated to keep playing.
Microgames are short, simple minigames that can be incorporated into an indie game as a way to break up the main gameplay and provide a quick burst of entertainment. Some examples of microgames that have been successful in other games include Tetris, Wordle, and various casino-inspired games. Microgames can be especially effective in mobile games, where players may only have a few minutes to play at a time.
PVP (player vs. player) battles are another type of gameplay element that can add excitement and competition to an indie game. These can be structured as one-on-one matches between players, or as larger, team-based battles. PVP battles can be a great way for players to test their skills against one another, and can also offer an opportunity for players to earn in-game rewards or bragging rights.
Overall, incorporating slot machines, missions, microgames, and PVP battles into an indie game can help to keep players engaged and coming back for more. It's important to consider how these elements will fit into the overall design and theme of the game, and to playtest them early and often to ensure that they are balanced and enjoyable for players.